What does the dummy value mean?

dummy 999  LAWJ 999 at Georgetown University in Washington, Section information text: Accessories · 849 999 999 xxxxx Separable Connector · 827 700 004 Dummy Plug · 827 714 011 Gas-Insulated Blind Cover · 866 999

Dummy 999, Bangkok, Thailand 4 likes Shopping & retail  About This Kit : This is a set of dummy currency of different denominations Its purpose is for educational game and activities

Amphibico 999-4510 Overview This Left-Handed Dummy Grip from Amphibico is an ergonomic plastic handle designed for their Turtle underwater video housings for Dummy 999 ₹80 excl GST ₹ incl GST ₹100 dummy: 999 999 Add to Cart Add To Sample Cart Product Details SKU : dummy999